· Premium Member
If power is getting all the way to the back of the trailer, that would lead me to believe it's a light assembly issue. With no fuses popping than there should be no short through that length of wire. I know you said you installed a new light assembly, did you possibly gain a bad bulb with the new assembly? Otherwise I would pull the wiring back off the new assembly and double check the wiring there. Good luck! I always hate chasing wiring gremlins. If you have a new relay or can swap it with another one try that as well.